Hu Guoqing, Pan Yingling, Zhao Xin, Yin Siyao, Zhang Meng, Zheng Zheng
Opt Lett. 2017 Dec 1;42(23):4942-4945. doi: 10.1364/OL.42.004942.
The evolution from asynchronous to synchronous dual-wavelength pulse generation in a passively mode-locked fiber laser is experimentally investigated by tailoring the intracavity dispersion. Through tuning the intracavity-loss-dependent gain profile and the birefringence-induced filter effect, asynchronous dual-wavelength soliton pulses can be generated until the intracavity anomalous dispersion is reduced to ∼8 fs/nm. The transition from asynchronous to synchronous pulse generation is then observed at an elevated pump power in the presence of residual anomalous dispersion, and it is shown that pulses are temporally synchronized at the mode-locker in the cavity. Spectral sidelobes are observed and could be attributed to the four-wave-mixing effect between dual-wavelength pulses at the carbon nanotube mode-locker. These results could provide further insight into the design and realization of such dual-wavelength ultrafast lasers for different applications such as dual-comb metrology as well as better understanding of the inter-pulse interactions in such dual-comb lasers.
通过调整腔内色散，对被动锁模光纤激光器中从异步到同步双波长脉冲产生的演化过程进行了实验研究。通过调节与腔内损耗相关的增益分布和双折射诱导的滤波效应，可以产生异步双波长孤子脉冲，直到腔内反常色散减小到约8 fs/nm。然后在存在残余反常色散的情况下，在泵浦功率升高时观察到从异步到同步脉冲产生的转变，结果表明腔内锁模器处的脉冲在时间上是同步的。观察到了光谱旁瓣，这可能归因于碳纳米管锁模器处双波长脉冲之间的四波混频效应。这些结果可以为设计和实现用于双梳计量等不同应用的此类双波长超快激光器提供进一步的见解，并有助于更好地理解此类双梳激光器中的脉冲间相互作用。
